Download Input Isolation Module

Wayside Signaling
Systems
Ansaldo STS USA
(Formerly known as Union Switch & Signal)
RSE-1D7
Rev. 4-07
Input Isolation Module
(MicroLok® II and MicroLok® Object Controller Applications)
To further protect and enhance the reliability of
MicroLok II, MicroLok Object Controller (OC) and
other system circuits, ASTS USA has developed
the Input Isolation Module as a companion
product to the Output Isolation Modules described
in RSE-1D6. In its simplest application, the Input
Isolation provides a stand alone component that
can isolate an external battery source. It can also
be used with the Bi-Polar Output Isolation Module
to permit series-chaining of three or more M-3E or
M-23E switch machines with Electronic Circuit
Controllers (see RSE-3A4).
General Description
Advantages
The Input Isolation Module is similar in operation to
ASTS USA’s Output Isolation Modules, however
instead of being driven from a MicroLok II or OC vital
output channel, this module is driven from an external
battery source. It can be used anywhere that the
battery arriving from an external source requires
isolation and the current demands of the output are
less than 1.5 watts.
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The Input Isolation Module can be set up with two
unipolar inputs or with a single bi-polar input. It
provides increased front end surge protection using
multiple stages of MOVs, inductors, and Tranzorbs.
The Input Isolation Module consists of a plastic, DIN
rail-mountable module with two internal circuit boards.
Built-in protection guards against a continuous short
circuit condition. Connections to the module are
made with four plug-in screw connectors. There are
16 screw connections which will accommodate wire
size from AWG 24 to AWG 12 with two screw
terminals for each connection. The plug-in
connectors are individually keyed for easy
replacement.
Two yellow LEDs on the front of the units indicate the
states of the circuit outputs.
The module does not requires any field maintenance.
In the unlikely event of a failure, a faulty module is
easily replaced as a complete unit.
To order, call 1-800-652-7276
e-mail: [email protected]
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Provides input circuit isolation from external battery
source
Configurable with two uni-polar inputs or one 1 bipolar input
Built-in protection against continuous short circuit
Enhanced with surge protection components
Easily installed and wired
No field tests or repairs required (field-replaceable
units)
Specifications
Input Connection Options:
Input Battery Range:
Load Drive (Each Circuit):
Output Voltage:
Input Source:
2 individual isolated
unipolar circuits
1 bi-polar input circuit
9.8 Vdc to 16.2 Vdc
(required to energize)
400 ohms impedance or
higher.
See tabulation on page 2.
Connected to external
battery source
Required protection:
Line-to-line and line-toground (ASTS USA
USGA; ref. RSE-3H2)
www.ansaldo-sts.com
RSE-1D7, p. 1
Ansaldo STS USA
Input Isolation Module
(Formerly known as Union Switch & Signal)
®
(MicroLok II and MicroLok® Object Controller
Applications)
RSE-1D7
Rev. 4-07
Specifications (cont’d)
Ordering and Additional Information
Input Impedance:
See tabulation below
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Short Circuit Protection:
Continuous short circuit
condition without damage
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Unit Dimensions:
See above diagam.
Approximate Output Voltages
Order No.
N34800901
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Refer to ordering tabulation for module part
numbers.
Refer to RSE-3H2 for ordering information on
USG-A Lightning Arresters.
Request ASTS USA Service Manual SM-9488 for
additional information on module installation and
applications.
Approximate Input Impedances
Input Isolation Module
Input Isolation Module (complete)
MicroLok® is a registered trademark of Ansaldo STS USA, Inc.
RSE-1D7, p. 2